Xcode 7.2 project migration to OS X El Capitan aborts build

Question

I started OS X Mavericks before with Xcode 7.1, I just upgraded to OS X El Capitan and Xcode 7.2. My application ran fine on the simulator and device without any warnings for the storyboard. Now I see a bunch of warnings about the missing limitations in the storyboard, and the application crashes with this error:

Application termination due to the uncaught exception "NSInvalidUnarchiveOperationException", reason: "Could not instantiate IBNSLayoutConstraint class"

I also tried the solution posted here: Failed to instantiate IBNSLayoutConstraint class

I could not find placeholder = "YES" anywhere in the xml, and my storyboard is too large to really go through each constraint to check if the Placeholder box is mistaken for any constraint.

I see the following warnings when viewing an xml storyboard.

Answer 1

You are not actually using a storyboard, but Xib. In your file you will find sections such as:

<mask key="constraints"> <exclude reference="6fq-cy-xp8"/> </mask> 

You want to open your .xib as "Source" and delete them so that the restrictions become installed .

Answer 2

Select Storyboard Disable Size to solve the problem. Hope this helps you! Thanks After creating the project, you can turn on the size class again.

Answer 3

and first of all, make sure that when you use IB to verify that you have no restrictions with the checkbox selected , “if the view for them belongs to“ not installed . ”Xcode 7.1 does not even give a warning about this, but 7.2 causes a crash

Answer 4

Disable AutoLayout on storyboard. This should solve your problem.